condition mean min max ZT0-3 74.6272453 69.84560371666666 79.40888688333334 ZT4-7 63.313203718333334 57.35006475 69.27634268666667 ZT8-11 65.48207641833334 62.77196821 68.19218462666667 ZT12-15 69.80839918000001 61.03686008333334 78.57993827666667 ZT16-19 58.416205245 52.48863329 64.3437772 ZT20-23 56.842580785 52.163279290000006 61.52188228